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Punnett Squares: Diagrams

Total questions: 21

Worksheet time: 42mins

Name
Class
Date
1.

What genotype would go in box 1?


Remember: Genotype is the combination of letters that represent the gene alleles inside the cells. Each cell will have two letters--one allele from each parent.

a)

BB

b)

Bb

c)

bb

2.

What genotype would go in box 2?


Remember: Genotype is the combination of letters that represent the gene alleles inside the cells. Each cell will have two letters--one allele from each parent.

a)

BB

b)

Bb

c)

bb

3.

What genotype would go in box 3?


Remember: Genotype is the combination of letters that represent the gene alleles inside the cells. Each cell will have two letters--one allele from each parent.

a)

BB

b)

Bb

c)

bb

4.

What genotype would go in box 4?


Remember: Genotype is the combination of letters that represent the gene alleles inside the cells. Each cell will have two letters--one allele from each parent.

a)

BB

b)

Bb

c)

bb

5.

What is the allele combination (genotype) for square 1?

a)

Dd

b)

DD

c)

dd

d)

D

6.

What belongs in the last box?

a)

RR

b)

Rr

c)

rr

d)

ff

7.
What allele combination should go in the missing box?
a)
AA
b)
Aa
c)
aa
d)
none of these
8.

Fill in the Yellow Box

a)

AA

b)

Aa

c)

aa

9.

Fill in the Yellow Box

a)

Bb

b)

BB

c)

bb

10.

What belongs in the missing square?

a)

tt

b)

Tt

c)

Bb

d)

TT

11.

Which shows the correct genotypes for this cross?

a)
b)
c)
d)
12.

B=blue flowers b=white flowers


If this tree makes four plants, how many will probably have blue flowers?

a)

0%

b)

25%

c)

50%

d)

75%

13.

R = red leaves

r = green leaves


If this plant makes four plants, how many will probably have red leaves?

a)

1

b)

2

c)

3

d)

4

14.

B = blue feathers

b = black feathers


What is the genotype for the black chickens?

a)

BB

b)

Bb

c)

bB

d)

bb

15.

A = yellow skin

a = green skin


Which genotypes are yellow skinned peas?

a)

a

b)

Aa

c)

AA

d)

AA and Aa

16.

A = yellow skin

a = green skin


Which is the dominant trait?

a)

yellow skinned peas

b)

green skinned peas

c)

They share dominance so they mix

17.

B = pink flower

b = white flower


Which trait is dominant?

a)

pink flower

b)

white flower

c)

They share dominance so they mix

18.

B = brown fur

W = white fur


Which trait is dominant?

a)

Brown fur

b)

white fur

c)

They share dominance so they mix

19.

W= white fur

B= black fur


Which fur is dominant?

a)

white fur

b)

black fur

c)

They share dominance so they mix

20.

BONUS: What must the genotype of the missing parent be?


Remember, the alleles of the parents label the columns and rows of the box, and each child genotype will match the parent of its row and its column.

a)

BB

b)

Bb

c)

bb

d)

Tt

21.

BONUS:

E = brown eyes

e = blue eyes

What color eyes do the parents have?

a)

one brown, one blue

b)

both blue

c)

both brown

d)

there's no way to tell based on this information